Released on 5 Jul 2012
MySQL 5.5.25a Changelog

Due to MSI restrictions, the MSI packages of MySQL 5.5.25a will treat the version as 5.5.26 internally; for example, as displayed by the Installation Wizard. MySQL itself reports the version as 5.5.25a; for example, if you check the value of the VERSION() SQL function or the version system variable.

Bugs Fixed

  • A regression bug in the optimizer could cause excessive disk usage for UPDATE statements on InnoDB tables. For tables created with innodb_file_per_table enabled, OPTIMIZE TABLE can be used to recover excessive space used. For tables created in the InnoDB system tablespace,it is necessary to perform a dump and restore into a new instance of the system tablespace. (Bug #65745, Bug #14248833)